The merger occurred because of the weak performance of both parties in the Singapore general election of 1955, but members started to merge with the Singapore People's Alliance (SPA) before the following general election of 1959. The LSP contested the general election of 1959 against the SPA, had a significant showing, gaining more than 8% of the popular vote and contesting 32 seats, but failed to win any of them. Following the election most of the LSP merged with the SPA and the rump of the LSP died out as the now ruling People's Action Party (PAP) gained dominance. The SPA itself would fade away during the incidents of merger, ensuing heated PAP-UMNO relations, and a shifted political focus towards an additional struggle between the PAP and the Barisan Sosialis. The LSP ceased to exist by 1965, when Singapore became fully independent, and never had the chance to win any......
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